Wow... this could open a whole new door to different devices used via USB.. *Cough* GPU *Caugh*

Even if they got USB 3.0 to run at 500MB/s that would only be the equivalent of PCIe 2.0 1x speed and have significantly higher latency. It would need to be somewhere in the range of 4GB-8GB/s to be competitive with modern cards, and I still think latency would be an issue.